| 摘要 |
A circular saw ( 1 ) includes a base ( 2 ) and a main body ( 3 ) mounted on the base and provided with an upper blade guard ( 7 ). Disposed behind the upper blade guard ( 7 ) is a stopper ( 22 ) which includes an upper curved portion ( 23 ) and an lower portion ( 24 ) coupled to the curved portion ( 23 ). One end of the lower portion ( 24 ) is attached to the main body ( 3 ) with a pivot screw ( 25 ) behind the blade guard ( 7 ) so as to permit the stopper to pivot on the screw ( 25 ) in parallel with a circular blade ( 5 ). Additionally, the curved portion ( 23 ) includes an arcuate guide slot ( 26 ). The stopper ( 22 ) further includes a fixing bolt ( 27 ) screwed in a boss ( 29 ) formed on the rear surface of the blade guard. The bolt ( 27 ) includes a lever ( 30 ) to be manually operated to selectively secure the curved portion to the bolt and release the curved portion therefrom. When the curved portion ( 23 ) is released, its pivotal position relative to the main body towards the base can be manually changed. Provided on the base is a projection ( 32 ) which is abutted by the stopper ( 22 ) when the main body ( 3 ) is lowered toward the base ( 2 ). When the curved portion ( 23 ) abuts the projection's upper surface ( 33 ), the amount of the blade ( 5 ) projecting below the base (i.e., the depth of cut) corresponds to the aforementioned relative position of the curved portion ( 23 ) with respect to the base ( 2 ).
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